Chassternbergia: Difference between revisions
J. Spencer (talk | contribs) merged with Edmontonia |
Extrapolaris (talk | contribs) Chassternbergia may prove generically distinct from Edmontonia if results of SVP 2015 abstract by Burns are published |
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#REDIRECT [[Edmontonia]] |
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{{Automatic taxobox |
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| name = ''Chassternbergia'' |
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| fossil_range = [[Late Cretaceous]], {{fossilrange|76.5|74.9}} |
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| image = Edmontonia half.jpg |
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| image_width = 250px |
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| image_caption = Mounted skeleton of ''C. rugosidens'', specimen AMNH 5665 |
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| authority = [[Charles M. Sternberg|Bakker]], 1928 |
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| subdivision_ranks = Species |
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| subdivision = |
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*''C. rugosidens'' <small>(Gilmore, 1930 [originally ''[[Palaeoscincus]] rugosidens'']) ([[type species|type]])</small> |
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}} |
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'''''Chassternbergia''''' is an [[Armour (zoology)|armoured]] [[dinosaur]], part of the [[nodosaur]] family from the Late [[Cretaceous]] [[Period (geology)|Period]]. |
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==Description== |
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===Size and general build=== |
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[[File:Edmontonia dinosaur.png|thumb|left|Restoration of ''C. rugosidens'']] |
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''Chassternbergia'' was bulky, broad and [[tank]]-like. Its length has been estimated at about 6.6 m (22 ft).<ref name="ageofdinosaursedmontonia"/> In 2010, [[Gregory S. Paul]] considered ''Chassternbergia'' to be six meters and weigh three tonnes.<ref name="Paul2010">Paul, G.S., 2010, ''The Princeton Field Guide to Dinosaurs'', Princeton University Press p. 238</ref> |
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''Chassternbergia'' had small, oval ridged bony plates on its back and head and many sharp spikes along its sides. The four largest spikes jutted out from the shoulders on each side, the second of which was split into subspines. Its skull had a [[pear]]-like shape when viewed from above.<ref name="ageofdinosaursedmontonia"/> Its neck and shoulders were protected by three halfrings made of large keeled plates. |
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===Distinguishing traits=== |
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In 1990, [[Kenneth Carpenter]] established some diagnostic traits for the genus as a whole, mainly comparing it with its close relative ''Panoplosaurus''. In top view, the snout has more parallel sides. The skull armour has a smooth surface. In the palate, the [[vomer]] is keeled. The [[neural arch]]es and [[neural spine]]s are shorter than those of ''Panoplosaurus''. The sacrum proper consists of three sacral vertebrae. In the shoulder girdle, the scapula and [[coracoid]] are not fused.<ref name="Carpenter1990"/> |
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==Paleoecology== |
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''Chassternbergia'' existed in the upper section of the Dinosaur Park Formation, about 76.5–75 million years ago. It lived alongside numerous other giant herbivores, such as the hadrosaurids ''[[Gryposaurus]]'', ''[[Corythosaurus]]'' and ''[[Parasaurolophus]]'', the ceratopsids ''[[Centrosaurus]]'' and ''[[Chasmosaurus]]'', and the ankylosaurids ''[[Scolosaurus]]'' and ''[[Dyoplosaurus]]''.<ref name=ABS09>{{cite journal |last=Arbour |first=V. M. |author2=Burns, M. E. |author3= Sissons, R. L. |year=2009 |title=A redescription of the ankylosaurid dinosaur ''Dyoplosaurus acutosquameus'' Parks, 1924 (Ornithischia: Ankylosauria) and a revision of the genus |journal=Journal of Vertebrate Paleontology |volume=29 |issue=4 |pages=1117–1135 |doi=10.1671/039.029.0405}}</ref> Studies of the jaw anatomy and mechanics of these dinosaurs suggests they probably all occupied slightly different ecological niches in order to avoid direct competition for food in such a crowded eco-space.<ref name=mallonetal2012>Mallon, J. C., Evans, D. C., Ryan, M. J., & Anderson, J. S. (2012). Megaherbivorous dinosaur turnover in the Dinosaur Park Formation (upper Campanian) of Alberta, Canada. Palaeogeography, Palaeoclimatology, Palaeoecology.</ref> The only large predators known from the same levels of the formation as ''Chassternbergia'' are the tyrannosaurids ''[[Gorgosaurus libratus]]'' and an unnamed species of ''[[Daspletosaurus]]''.<ref name=ABS09/> |
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==References== |
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{{reflist}} |
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[[Category:Nodosaurids]] |
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[[Category:Dinosaurs of North America]] |
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[[Category:Cretaceous dinosaurs]] |
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Revision as of 04:45, 7 November 2015
| Chassternbergia Temporal range: Late Cretaceous,
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|---|---|
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| Mounted skeleton of C. rugosidens, specimen AMNH 5665 | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | †Ornithischia |
| Clade: | †Thyreophora |
| Clade: | †Ankylosauria |
| Family: | †Nodosauridae |
| Genus: | †Chassternbergia Bakker, 1928 |
| Species | |
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Chassternbergia is an armoured dinosaur, part of the nodosaur family from the Late Cretaceous Period.
Description
Size and general build
Chassternbergia was bulky, broad and tank-like. Its length has been estimated at about 6.6 m (22 ft).[1] In 2010, Gregory S. Paul considered Chassternbergia to be six meters and weigh three tonnes.[2]
Chassternbergia had small, oval ridged bony plates on its back and head and many sharp spikes along its sides. The four largest spikes jutted out from the shoulders on each side, the second of which was split into subspines. Its skull had a pear-like shape when viewed from above.[1] Its neck and shoulders were protected by three halfrings made of large keeled plates.
Distinguishing traits
In 1990, Kenneth Carpenter established some diagnostic traits for the genus as a whole, mainly comparing it with its close relative Panoplosaurus. In top view, the snout has more parallel sides. The skull armour has a smooth surface. In the palate, the vomer is keeled. The neural arches and neural spines are shorter than those of Panoplosaurus. The sacrum proper consists of three sacral vertebrae. In the shoulder girdle, the scapula and coracoid are not fused.[3]
Paleoecology
Chassternbergia existed in the upper section of the Dinosaur Park Formation, about 76.5–75 million years ago. It lived alongside numerous other giant herbivores, such as the hadrosaurids Gryposaurus, Corythosaurus and Parasaurolophus, the ceratopsids Centrosaurus and Chasmosaurus, and the ankylosaurids Scolosaurus and Dyoplosaurus.[4] Studies of the jaw anatomy and mechanics of these dinosaurs suggests they probably all occupied slightly different ecological niches in order to avoid direct competition for food in such a crowded eco-space.[5] The only large predators known from the same levels of the formation as Chassternbergia are the tyrannosaurids Gorgosaurus libratus and an unnamed species of Daspletosaurus.[4]
References
- ^ a b Cite error: The named reference
ageofdinosaursedmontoniawas invoked but never defined (see the help page). - ^ Paul, G.S., 2010, The Princeton Field Guide to Dinosaurs, Princeton University Press p. 238
- ^ Cite error: The named reference
Carpenter1990was invoked but never defined (see the help page). - ^ a b Arbour, V. M.; Burns, M. E.; Sissons, R. L. (2009). "A redescription of the ankylosaurid dinosaur Dyoplosaurus acutosquameus Parks, 1924 (Ornithischia: Ankylosauria) and a revision of the genus". Journal of Vertebrate Paleontology. 29 (4): 1117–1135. doi:10.1671/039.029.0405.
- ^ Mallon, J. C., Evans, D. C., Ryan, M. J., & Anderson, J. S. (2012). Megaherbivorous dinosaur turnover in the Dinosaur Park Formation (upper Campanian) of Alberta, Canada. Palaeogeography, Palaeoclimatology, Palaeoecology.